Spatially multiplexing physical uplink control channel (pucch) and sounding reference signal (srs)

ABSTRACT

A design is provided for spatially multiplexing uplink channels. A user equipment (UE) detects that a Physical Uplink Control Channel (PUCCH) and a Sounding Reference Signal (SRS) are to be transmitted simultaneously. The UE decides to spatially multiplex the PUCCH and the SRS for simultaneous transmission via different sets of one or more antennas. The UE determines time and frequency resources for the PUCCH and the SRS to avoid collision of at least a portion of the PUCCH with the SRS. The UE transmits the spatially multiplexed PUCCH and SRS using the determined time and frequency resources.

This application claims priority to Greek Provisional Application No.20180100253, entitled “SPATIALLY MULTIPLEXING PHYSICAL UPLINK CONTROLCHANNEL (PUCCH) AND SOUNDING REFERENCE SIGNAL (SRS)”, filed on Jun. 8,2018, which is expressly incorporated by reference in its entirety.

TECHNICAL FIELD

Aspects of the present disclosure relate to wireless communications, andmore particularly, to spatially multiplexing Physical Uplink ControlChannel (PUCCH) and Sounding Reference Signal (SRS).

INTRODUCTION

Wireless communication systems are widely deployed to provide varioustelecommunication services such as telephony, video, data, messaging,broadcasts, etc. These wireless communication systems may employmultiple-access technologies capable of supporting communication withmultiple users by sharing available system resources (e.g., bandwidth,transmit power, etc.). Examples of such multiple-access systems include3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE)systems, LTE Advanced (LTE-A) systems, code division multiple access(CDMA) systems, time division multiple access (TDMA) systems, frequencydivision multiple access (FDMA) systems, orthogonal frequency divisionmultiple access (OFDMA) systems, single-carrier frequency divisionmultiple access (SC-FDMA) systems, and time division synchronous codedivision multiple access (TD-SCDMA) systems, to name a few.

In some examples, a wireless multiple-access communication system mayinclude a number of base stations (BSs), which are each capable ofsimultaneously supporting communication for multiple communicationdevices, otherwise known as user equipments (UEs). In an LTE or LTE-Anetwork, a set of one or more base stations may define an eNodeB (eNB).In other examples (e.g., in a next generation, a new radio (NR), or 5Gnetwork), a wireless multiple access communication system may include anumber of distributed units (DUs) (e.g., edge units (EUs), edge nodes(ENs), radio heads (RHs), smart radio heads (SRHs), transmissionreception points (TRPs), etc.) in communication with a number of centralunits (CUs) (e.g., central nodes (CNs), access node controllers (ANCs),etc.), where a set of one or more distributed units, in communicationwith a central unit, may define an access node (e.g., which may bereferred to as a base station, 5G NB, next generation NodeB (gNB orgNodeB), TRP, etc.). A base station or distributed unit may communicatewith a set of UEs on downlink channels (e.g., for transmissions from abase station or to a UE) and uplink channels (e.g., for transmissionsfrom a UE to a base station or distributed unit).

These multiple access technologies have been adopted in varioustelecommunication standards to provide a common protocol that enablesdifferent wireless devices to communicate on a municipal, national,regional, and even global level. New Radio (NR) (e.g., 5G) is an exampleof an emerging telecommunication standard. NR is a set of enhancementsto the LTE mobile standard promulgated by 3GPP. It is designed to bettersupport mobile broadband Internet access by improving spectralefficiency, lowering costs, improving services, making use of newspectrum, and better integrating with other open standards using OFDMAwith a cyclic prefix (CP) on the downlink (DL) and on the uplink (UL).To these ends, NR supports beamforming, multiple-input multiple-output(MIMO) antenna technology, and carrier aggregation.

However, as the demand for mobile broadband access continues toincrease, there exists a need for further improvements in NR and LTEtechnology. Preferably, these improvements should be applicable to othermulti-access technologies and the telecommunication standards thatemploy these technologies.

BRIEF SUMMARY

The systems, methods, and devices of the disclosure each have severalaspects, no single one of which is solely responsible for its desirableattributes. Without limiting the scope of this disclosure as expressedby the claims which follow, some features will now be discussed briefly.After considering this discussion, and particularly after reading thesection entitled “Detailed Description” one will understand how thefeatures of this disclosure provide advantages that include improvedcommunications between access points and stations in a wireless network.

Certain aspects provide a method for wireless communication by a UserEquipment (UE). The method generally includes detecting that a PhysicalUplink Control Channel (PUCCH) and a Sounding Reference Signal (SRS) areto be transmitted simultaneously; deciding to spatially multiplex thePUCCH and the SRS for simultaneous transmission via different sets ofone or more antennas; determining time and frequency resources for thePUCCH and the SRS to avoid collision of at least a portion of the PUCCHwith the SRS; transmitting the spatially multiplexed PUCCH and SRS usingthe determined time and frequency resources.

In an aspect, the detecting includes detecting that the PUCCH and theSRS are configured or scheduled to be transmitted in a same OFDM symbol.

In an aspect, the portion includes a Demodulation Reference Signal(DMRS).

In an aspect, determining the time and frequency resources includesdetermining different time and frequency resources for the DMRS and theSRS.

In an aspect, the PUCCH is according to PUCCH Formats 1, 3 or 4.

In an aspect, determining the time and frequency resources includesdetermining that the SRS and the DMRS are to be transmitted on differentOFDM symbols.

In an aspect, determining the time and frequency resources includesdetermining the SRS is to be transmitted on the same OFDM symbol in adifferent resource block than the DMRS.

In an aspect, determining the time and frequency resources includesdetermining the SRS is to be transmitted on the same OFDM symbol and ina same resource block as the DMRS, wherein the SRS is scheduled onresource elements (REs) not scheduled for the DMRS.

In an aspect, the PUCCH is according to PUCCH Format 2.

In an aspect, detecting that the PUCCH and the SRS are to be transmittedsimultaneously includes detecting the SRS is to be transmitted on thesame OFDM symbol in a same resource block as the DMRS.

In an aspect, determining the time and frequency resources includesdetermining a comb pattern for the SRS same as a comb pattern used forthe DMRS; and determining the resources for the SRS based on thedetermined comb pattern on subcarriers not occupied by the DMRS.

In an aspect, detecting that the PUCCH and the SRS are to be transmittedsimultaneously includes detecting that at least a remaining portion ofthe PUCCH and the SRS are configured to be transmitted on a same OFDMsymbol of a same resource block.

In an aspect, determining the time and frequency resources includesdetermining the same OFDM symbol of the same resource block fortransmission of the remaining portion and the SRS if the SRS is at leastone of X resource blocks wide or Y times wider than the PUCCH.

In an aspect, values of X and Y are determined based on at least one ofa SRS use case or a format of the PUCCH.

In an aspect, the value of X and Y are configured via Radio ResourceControl (RRC) signaling.

In an aspect, determining the time and frequency resources furtherincludes determining a puncturing pattern for the SRS; and determiningthe resources for the remaining portion by puncturing resource elements(REs) scheduled for the SRS based on the puncturing pattern.

In an aspect, the puncturing pattern is based on a format of the PUCCH.

In an aspect, the determining further includes rate matchingtransmission of the SRS around transmission of the remaining portion.

In an aspect, the remaining portion includes uplink control information(UCI).

Certain aspects provide a method for wireless communication a UserEquipment (UE). The method generally includes deciding to spatiallymultiplex a Physical Uplink Shared Channel (PUSCH) and a SoundingReference Signal (SRS) for simultaneous transmission via different setsof one or more antennas; determining that Uplink Control Information(UCI) is to be transmitted using resources assigned for the PUSCH, andthat at least a portion of time and frequency resources for the PUSCH isto be used for transmission of the SRS; determining a resource mappingpattern for mapping the UCI to the PUSCH resources, wherein the resourcemapping pattern avoids collision of the UCI with the SRS; mapping theUCI to the PUSCH resources based on the resource mapping pattern; andtransmitting the spatially multiplexed PUSCH and the SRS after themapping.

In an aspect, the mapping includes mapping at least a portion of UCIbits indicating acknowledgement/negative acknowledgement (ACK/NACK)using the PUSCH resources not to be used for the SRS.

In an aspect, the mapping includes, after mapping the at least a portionof the UCI bits indicating ACK/NACK, mapping a remaining portion of theUCI bits indicating ACK/NACK and at least a portion of the UCI bitsindicating channel state indication (CSI) using the PUSCH resources tobe used for SRS.

In an aspect, the mapping includes mapping UCI bits indicatingacknowledgement/negative acknowledgement (ACK/NACK) before mapping theUCI bits indicating channel state indication (CSI).

Certain aspects provide a method for wireless communication by a BaseStation (BS). The method generally includes indicating to a UserEquipment (UE) that a Physical Uplink Control Channel (PUCCH) and aSounding Reference Signal (SRS) are to be transmitted simultaneouslywithin a same component carrier via different sets of one or moreantennas at the UE; determining time and frequency resources for thePUCCH and the SRS to avoid collision of at least a portion of the PUCCHwith the SRS; signaling the determined time and frequency resources tothe UE; and receiving the spatially multiplexed PUCCH and SRS using thedetermined time and frequency resources.

In an aspect, the indicating includes configuring or scheduling the UEto transmit the PUCCH and the SRS in a same OFDM symbol.

In an aspect, the portion includes an uplink Demodulation ReferenceSignal (DMRS).

In an aspect, determining the time and frequency resources includesdetermining different time and frequency resources for the DMRS and theSRS.

In an aspect, the PUCCH is according to PUCCH Formats 1, 3 or 4.

In an aspect, determining the time and frequency resources includesdetermining that the SRS and the DMRS are to be received on differentOFDM symbols.

In an aspect, determining the time and frequency resources includesdetermining the SRS is to be received on the same OFDM symbol in adifferent resource block than the DMRS.

In an aspect, determining the time and frequency resources includesdetermining the SRS is to be received on the same OFDM symbol and in asame resource block as the DMRS, wherein the SRS is scheduled onresource elements (REs) not scheduled for the DMRS.

In an aspect, the PUCCH is according to PUCCH Format 2.

In an aspect, determining the SRS is to be received on the same OFDMsymbol in a same resource block as the DMRS.

In an aspect, determining the time and frequency resources includesdetermining a comb pattern for the SRS same as a comb pattern used forthe DMRS; and determining the resources for the SRS based on thedetermined comb pattern on subcarriers not occupied by the DMRS.

In an aspect, determining the time and frequency resources includesdetermining that at least a remaining portion of the PUCCH and the SRSare to be transmitted by the UE on a same OFDM symbol of a same resourceblock.

In an aspect, determining the time and frequency resources includesdetermining the same OFDM symbol of the same resource block forreceiving the remaining portion and the SRS if the SRS is at least oneof X resource blocks wide or Y times wider than the PUCCH.

In an aspect, values of X and Y are based on at least one of a SRS usecase or a format of the PUCCH.

In an aspect, the method further includes transmitting values of X and Yvia Radio Resource Control (RRC) signaling to the UE.

In an aspect, determining the time and frequency resources furtherincludes determining a puncturing pattern for the SRS; and determiningthe resources for the remaining portion by puncturing resource elements(REs) scheduled for the SRS based on the puncturing pattern.

In an aspect, the puncturing pattern is based on a format of the PUCCH.

In an aspect, the remaining portion includes uplink control information(UCI).

Certain aspects provide a method for wireless communication by a BaseStation (BS). The method generally includes deciding that a PhysicalUplink Shared Channel (PUSCH) and a Sounding Reference Signal (SRS) areto be spatially multiplexed for simultaneous transmission from a UE viadifferent sets of one or more antennas at a UE; indicating the spatialmultiplexing to the UE; detecting that Uplink Control Information (UCI)is to be received using resources assigned for the PUSCH, and that atleast a portion of time and frequency resources for the PUSCH is to beused for receiving a Sounding Reference Signal (SRS); determining aresource mapping pattern for mapping the UCI to the PUSCH resources,wherein the resource mapping pattern avoids collision of the UCI withthe SRS; and receiving the UCI based on the resource mapping pattern.

In an aspect, the resource mapping pattern includes mapping at least aportion of UCI bits indicating acknowledgement/negative acknowledgement(ACK/NACK) using the PUSCH resources not to be used for the SRS.

In an aspect, the resource mapping pattern includes, after mapping atleast a portion of the UCI bits indicating ACK/NACK, mapping a remainingportion of the UCI bits indicating ACK/NACK and at least a portion ofthe UCI bits indicating channel state indication (CSI) using the PUSCHresources to be used for SRS.

In an aspect, the resource mapping pattern includes mapping UCI bitsindicating acknowledgement before the UCI bits indicating channel stateindication (CSI).

To the accomplishment of the foregoing and related ends, the one or moreaspects comprise the features hereinafter fully described andparticularly pointed out in the claims. The following description andthe appended drawings set forth in detail certain illustrative featuresof the one or more aspects. These features are indicative, however, ofbut a few of the various ways in which the principles of various aspectsmay be employed.

BRIEF DESCRIPTION OF THE DRAWINGS

So that the manner in which the above-recited features of the presentdisclosure can be understood in detail, a more particular description,briefly summarized above, may be had by reference to aspects, some ofwhich are illustrated in the drawings. It is to be noted, however, thatthe appended drawings illustrate only certain typical aspects of thisdisclosure and are therefore not to be considered limiting of its scope,for the description may admit to other equally effective aspects.

FIG. 1 is a block diagram conceptually illustrating an exampletelecommunications system, in accordance with certain aspects of thepresent disclosure.

FIG. 2 is a block diagram illustrating an example logical architectureof a distributed radio access network (RAN), in accordance with certainaspects of the present disclosure.

FIG. 3 is a diagram illustrating an example physical architecture of adistributed RAN, in accordance with certain aspects of the presentdisclosure.

FIG. 4 is a block diagram conceptually illustrating a design of anexample base station (BS) and user equipment (UE), in accordance withcertain aspects of the present disclosure.

FIG. 5 is a diagram showing examples for implementing a communicationprotocol stack, in accordance with certain aspects of the presentdisclosure.

FIG. 6 illustrates an example of a frame format for a new radio (NR)system, in accordance with certain aspects of the present disclosure.

FIG. 7A illustrates spatially multiplexing UL SRS and UL PUCCH, inaccordance with certain aspects of the present disclosure.

FIG. 7B illustrates spatially multiplexing UL SRS and UL PUSCH(including piggybacked UCI), in accordance with certain aspects of thepresent disclosure.

FIG. 8 illustrates example operations performed by a User Equipment (UE)for spatially multiplexing uplink channels, in accordance with certainaspects of the present disclosure.

FIG. 9 illustrates example operations performed by a base station (BS)for spatially multiplexing uplink channels, in accordance with certainaspects of the present disclosure.

FIG. 10 illustrates spatially multiplexing SRS with PUCCH format 2, inaccordance with certain aspects of the present disclosure.

FIG. 11 illustrates example operations for mapping UCI to PUSCHresources when the PDSCH collides with SRS, in accordance with certainaspects of the present disclosure.

FIG. 12 illustrates example operations performed by a Base Station (BS)for mapping UCI to PUSCH resources when the PUSCH collides with SRS, inaccordance with certain aspects of the present disclosure.

FIGS. 13-16 illustrate a communications device that may include variouscomponents configured to perform operations for the techniques disclosedherein in accordance with aspects of the present disclosure.

To facilitate understanding, identical reference numerals have beenused, where possible, to designate identical elements that are common tothe figures. It is contemplated that elements disclosed in one aspectmay be beneficially utilized on other aspects without specificrecitation.

DETAILED DESCRIPTION

One constraint for uplink transmissions in 5G NR (e.g., according toRelease 15) is that a UE is allowed to transmit only one uplink channelat one time when the UE is assigned only one component carrier (CC).Multiple uplink channels (e.g., PUCCH, PUSCH, SRS, etc.) can only beTime Division Multiplexed (TDM) within one CC. The NR standards do notallow using any other multiplexing mechanism (e.g., Frequency DivisionMultiplexing, FDM, Code Division Multiplexing, CDM, etc.) to transmitmultiple uplink channels at one time within one CC.

A problem with this constraint is that if the UE has multiple uplinkchannels configured to be transmitted at the same time, this leads to acollision of the channels. In such a case, the UE either has to drop oneor more channels in favor of a particular channel or has to followcomplicated rules to resolve the collision.

In certain aspects, future NR releases are likely to support multipleuplink transmit antennas/transmit chains at the UE. In certain aspects,having multiple transmit antennas/transmit chains allows a UE totransmit multiple uplink channels to a gNB simultaneously in the sametime and frequency resources using spatial multiplexing within the sameCC.

Certain aspects of the present disclosure discuss a design for spatiallymultiplexing two or more uplink control channels for UEs that supportmultiple uplink transmit antennas. For example, spatial multiplexing ofSRS and PUCCH includes transmitting SRS using a first set of one or moreUL antennas and transmitting PUCCH using a second set of one or more ULantennas different from the first set.

The following description provides examples, and is not limiting of thescope, applicability, or examples set forth in the claims. Changes maybe made in the function and arrangement of elements discussed withoutdeparting from the scope of the disclosure. Various examples may omit,substitute, or add various procedures or components as appropriate. Forinstance, the methods described may be performed in an order differentfrom that described, and various steps may be added, omitted, orcombined. Also, features described with respect to some examples may becombined in some other examples. For example, an apparatus may beimplemented or a method may be practiced using any number of the aspectsset forth herein. In addition, the scope of the disclosure is intendedto cover such an apparatus or method which is practiced using otherstructure, functionality, or structure and functionality in addition to,or other than, the various aspects of the disclosure set forth herein.It should be understood that any aspect of the disclosure disclosedherein may be embodied by one or more elements of a claim. The word“exemplary” is used herein to mean “serving as an example, instance, orillustration.” Any aspect described herein as “exemplary” is notnecessarily to be construed as preferred or advantageous over otheraspects.

The techniques described herein may be used for various wirelesscommunication technologies, such as LTE, CDMA, TDMA, FDMA, OFDMA,SC-FDMA and other networks. The terms “network” and “system” are oftenused interchangeably. A CDMA network may implement a radio technologysuch as Universal Terrestrial Radio Access (UTRA), cdma2000, etc. UTRAincludes Wideband CDMA (WCDMA) and other variants of CDMA. cdma2000covers IS-2000, IS-95 and IS-856 standards. A TDMA network may implementa radio technology such as Global System for Mobile Communications(GSM). An OFDMA network may implement a radio technology such as NR(e.g. 5G RA), Evolved UTRA (E-UTRA), Ultra Mobile Broadband (UMB), IEEE802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDMA, etc. UTRAand E-UTRA are part of Universal Mobile Telecommunication System (UMTS).

New Radio (NR) is an emerging wireless communications technology underdevelopment in conjunction with the 5G Technology Forum (5GTF). 3GPPLong Term Evolution (LTE) and LTE-Advanced (LTE-A) are releases of UMTSthat use E-UTRA. UTRA, E-UTRA, UMTS, LTE, LTE-A and GSM are described indocuments from an organization named “3rd Generation PartnershipProject” (3GPP). cdma2000 and UMB are described in documents from anorganization named “3rd Generation Partnership Project 2” (3GPP2). Thetechniques described herein may be used for the wireless networks andradio technologies mentioned above as well as other wireless networksand radio technologies. For clarity, while aspects may be describedherein using terminology commonly associated with 3G and/or 4G wirelesstechnologies, aspects of the present disclosure can be applied in othergeneration-based communication systems, such as 5G and later, includingNR technologies.

New radio (NR) access (e.g., 5G technology) may support various wirelesscommunication services, such as enhanced mobile broadband (eMBB)targeting wide bandwidth (e.g., 80 MHz or beyond), millimeter wave (mmW)targeting high carrier frequency (e.g., 25 GHz or beyond), massivemachine type communications MTC (mMTC) targeting non-backward compatibleMTC techniques, and/or mission critical targeting ultra-reliablelow-latency communications (URLLC). These services may include latencyand reliability requirements. These services may also have differenttransmission time intervals (TTI) to meet respective quality of service(QoS) requirements. In addition, these services may co-exist in the samesubframe.

Example Wireless Communications System

FIG. 1 illustrates an example wireless communication network 100 inwhich aspects of the present disclosure may be performed. For example,the wireless communication network 100 may be a New Radio (NR) or 5Gnetwork. In a an aspect, each of the BSs 110 and each of the UEs 120 maybe configured to perform operations related to spatially multiplexingPUCCH and SRS, according to aspects described herein.

As illustrated in FIG. 1, the wireless network 100 may include a numberof base stations (BSs) 110 and other network entities. A BS may be astation that communicates with user equipments (UEs). Each BS 110 mayprovide communication coverage for a particular geographic area. In3GPP, the term “cell” can refer to a coverage area of a Node B (NB)and/or a Node B subsystem serving this coverage area, depending on thecontext in which the term is used. In NR systems, the term “cell” andnext generation NodeB (gNB), new radio base station (NR BS), 5G NB,access point (AP), or transmission reception point (TRP) may beinterchangeable. In some examples, a cell may not necessarily bestationary, and the geographic area of the cell may move according tothe location of a mobile BS. In some examples, the base stations may beinterconnected to one another and/or to one or more other base stationsor network nodes (not shown) in wireless communication network 100through various types of backhaul interfaces, such as a direct physicalconnection, a wireless connection, a virtual network, or the like usingany suitable transport network.

In general, any number of wireless networks may be deployed in a givengeographic area. Each wireless network may support a particular radioaccess technology (RAT) and may operate on one or more frequencies. ARAT may also be referred to as a radio technology, an air interface,etc. A frequency may also be referred to as a carrier, a subcarrier, afrequency channel, a tone, a subband, etc. Each frequency may support asingle RAT in a given geographic area in order to avoid interferencebetween wireless networks of different RATs. In some cases, NR or 5G RATnetworks may be deployed.

A base station (BS) may provide communication coverage for a macro cell,a pico cell, a femto cell, and/or other types of cells. A macro cell maycover a relatively large geographic area (e.g., several kilometers inradius) and may allow unrestricted access by UEs with servicesubscription. A pico cell may cover a relatively small geographic areaand may allow unrestricted access by UEs with service subscription. Afemto cell may cover a relatively small geographic area (e.g., a home)and may allow restricted access by UEs having an association with thefemto cell (e.g., UEs in a Closed Subscriber Group (CSG), UEs for usersin the home, etc.). A BS for a macro cell may be referred to as a macroBS. ABS for a pico cell may be referred to as a pico BS. ABS for a femtocell may be referred to as a femto BS or a home BS. In the example shownin FIG. 1, the BSs 110 a, 110 b and 110 c may be macro BSs for the macrocells 102 a, 102 b and 102 c, respectively. The BS 110 x may be a picoBS for a pico cell 102 x. The BSs 110 y and 110 z may be femto BSs forthe femto cells 102 y and 102 z, respectively. A BS may support one ormultiple (e.g., three) cells.

Wireless communication network 100 may also include relay stations. Arelay station is a station that receives a transmission of data and/orother information from an upstream station (e.g., a BS or a UE) andsends a transmission of the data and/or other information to adownstream station (e.g., a UE or a BS). A relay station may also be aUE that relays transmissions for other UEs. In the example shown in FIG.1, a relay station 110 r may communicate with the BS 110 a and a UE 120r in order to facilitate communication between the BS 110 a and the UE120 r. A relay station may also be referred to as a relay BS, a relay,etc.

Wireless network 100 may be a heterogeneous network that includes BSs ofdifferent types, e.g., macro BS, pico BS, femto BS, relays, etc. Thesedifferent types of BSs may have different transmit power levels,different coverage areas, and different impact on interference in thewireless network 100. For example, macro BS may have a high transmitpower level (e.g., 20 Watts) whereas pico BS, femto BS, and relays mayhave a lower transmit power level (e.g., 1 Watt).

Wireless communication network 100 may support synchronous orasynchronous operation. For synchronous operation, the BSs may havesimilar frame timing, and transmissions from different BSs may beapproximately aligned in time. For asynchronous operation, the BSs mayhave different frame timing, and transmissions from different BSs maynot be aligned in time. The techniques described herein may be used forboth synchronous and asynchronous operation.

A network controller 130 may couple to a set of BSs and providecoordination and control for these BSs. The network controller 130 maycommunicate with the BSs 110 via a backhaul. The BSs 110 may alsocommunicate with one another (e.g., directly or indirectly) via wirelessor wireline backhaul.

The UEs 120 (e.g., 120 x, 120 y, etc.) may be dispersed throughout thewireless network 100, and each UE may be stationary or mobile. A UE mayalso be referred to as a mobile station, a terminal, an access terminal,a subscriber unit, a station, a Customer Premises Equipment (CPE), acellular phone, a smart phone, a personal digital assistant (PDA), awireless modem, a wireless communication device, a handheld device, alaptop computer, a cordless phone, a wireless local loop (WLL) station,a tablet computer, a camera, a gaming device, a netbook, a smartbook, anultrabook, an appliance, a medical device or medical equipment, abiometric sensor/device, a wearable device such as a smart watch, smartclothing, smart glasses, a smart wrist band, smart jewelry (e.g., asmart ring, a smart bracelet, etc.), an entertainment device (e.g., amusic device, a video device, a satellite radio, etc.), a vehicularcomponent or sensor, a smart meter/sensor, industrial manufacturingequipment, a global positioning system device, or any other suitabledevice that is configured to communicate via a wireless or wired medium.Some UEs may be considered machine-type communication (MTC) devices orevolved MTC (eMTC) devices. MTC and eMTC UEs include, for example,robots, drones, remote devices, sensors, meters, monitors, locationtags, etc., that may communicate with a BS, another device (e.g., remotedevice), or some other entity. A wireless node may provide, for example,connectivity for or to a network (e.g., a wide area network such asInternet or a cellular network) via a wired or wireless communicationlink. Some UEs may be considered Internet-of-Things (IoT) devices, whichmay be narrowband IoT (NB-IoT) devices.

Certain wireless networks (e.g., LTE) utilize orthogonal frequencydivision multiplexing (OFDM) on the downlink and single-carrierfrequency division multiplexing (SC-FDM) on the uplink. OFDM and SC-FDMpartition the system bandwidth into multiple (K) orthogonal subcarriers,which are also commonly referred to as tones, bins, etc. Each subcarriermay be modulated with data. In general, modulation symbols are sent inthe frequency domain with OFDM and in the time domain with SC-FDM. Thespacing between adjacent subcarriers may be fixed, and the total numberof subcarriers (K) may be dependent on the system bandwidth. Forexample, the spacing of the subcarriers may be 15 kHz and the minimumresource allocation (called a “resource block” (RB)) may be 12subcarriers (or 180 kHz). Consequently, the nominal Fast FourierTransfer (FFT) size may be equal to 128, 256, 512, 1024 or 2048 forsystem bandwidth of 1.25, 2.5, 5, 10, or 20 megahertz (MHz),respectively. The system bandwidth may also be partitioned intosubbands. For example, a subband may cover 1.08 MHz (i.e., 6 resourceblocks), and there may be 1, 2, 4, 8, or 16 subbands for systembandwidth of 1.25, 2.5, 5, 10 or 20 MHz, respectively.

While aspects of the examples described herein may be associated withLTE technologies, aspects of the present disclosure may be applicablewith other wireless communications systems, such as NR. NR may utilizeOFDM with a CP on the uplink and downlink and include support forhalf-duplex operation using TDD. Beamforming may be supported and beamdirection may be dynamically configured. MIMO transmissions withprecoding may also be supported. MIMO configurations in the DL maysupport up to 8 transmit antennas with multi-layer DL transmissions upto 8 streams and up to 2 streams per UE. Multi-layer transmissions withup to 2 streams per UE may be supported. Aggregation of multiple cellsmay be supported with up to 8 serving cells.

In some examples, access to the air interface may be scheduled, whereina. A scheduling entity (e.g., a base station) allocates resources forcommunication among some or all devices and equipment within its servicearea or cell. The scheduling entity may be responsible for scheduling,assigning, reconfiguring, and releasing resources for one or moresubordinate entities. That is, for scheduled communication, subordinateentities utilize resources allocated by the scheduling entity. Basestations are not the only entities that may function as a schedulingentity. In some examples, a UE may function as a scheduling entity andmay schedule resources for one or more subordinate entities (e.g., oneor more other UEs), and the other UEs may utilize the resourcesscheduled by the UE for wireless communication. In some examples, a UEmay function as a scheduling entity in a peer-to-peer (P2P) network,and/or in a mesh network. In a mesh network example, UEs may communicatedirectly with one another in addition to communicating with a schedulingentity.

In FIG. 1, a solid line with double arrows indicates desiredtransmissions between a UE and a serving BS, which is a BS designated toserve the UE on the downlink and/or uplink. A finely dashed line withdouble arrows indicates interfering transmissions between a UE and a BS.

FIG. 2 illustrates an example logical architecture of a distributedRadio Access Network (RAN) 200, which may be implemented in the wirelesscommunication network 100 illustrated in FIG. 1. A 5G access node 206may include an access node controller (ANC) 202. ANC 202 may be acentral unit (CU) of the distributed RAN 200. The backhaul interface tothe Next Generation Core Network (NG-CN) 204 may terminate at ANC 202.The backhaul interface to neighboring next generation access Nodes(NG-ANs) 210 may terminate at ANC 202. ANC 202 may include one or moretransmission reception points (TRPs) 208 (e.g., cells, BSs, gNBs, etc.).

The TRPs 208 may be a distributed unit (DU). TRPs 208 may be connectedto a single ANC (e.g., ANC 202) or more than one ANC (not illustrated).For example, for RAN sharing, radio as a service (RaaS), and servicespecific AND deployments, TRPs 208 may be connected to more than oneANC. TRPs 208 may each include one or more antenna ports. TRPs 208 maybe configured to individually (e.g., dynamic selection) or jointly(e.g., joint transmission) serve traffic to a UE.

The logical architecture of distributed RAN 200 may support fronthaulingsolutions across different deployment types. For example, the logicalarchitecture may be based on transmit network capabilities (e.g.,bandwidth, latency, and/or jitter).

The logical architecture of distributed RAN 200 may share featuresand/or components with LTE. For example, next generation access node(NG-AN) 210 may support dual connectivity with NR and may share a commonfronthaul for LTE and NR.

The logical architecture of distributed RAN 200 may enable cooperationbetween and among TRPs 208, for example, within a TRP and/or across TRPsvia ANC 202. An inter-TRP interface may not be used.

Logical functions may be dynamically distributed in the logicalarchitecture of distributed RAN 200. As will be described in more detailwith reference to FIG. 5, the Radio Resource Control (RRC) layer, PacketData Convergence Protocol (PDCP) layer, Radio Link Control (RLC) layer,Medium Access Control (MAC) layer, and a Physical (PHY) layers may beadaptably placed at the DU (e.g., TRP 208) or CU (e.g., ANC 202).

FIG. 3 illustrates an example physical architecture of a distributedRadio Access Network (RAN) 300, according to aspects of the presentdisclosure. A centralized core network unit (C-CU) 302 may host corenetwork functions. C-CU 302 may be centrally deployed. C-CU 302functionality may be offloaded (e.g., to advanced wireless services(AWS)), in an effort to handle peak capacity.

A centralized RAN unit (C-RU) 304 may host one or more ANC functions.Optionally, the C-RU 304 may host core network functions locally. TheC-RU 304 may have distributed deployment. The C-RU 304 may be close tothe network edge.

A DU 306 may host one or more TRPs (Edge Node (EN), an Edge Unit (EU), aRadio Head (RH), a Smart Radio Head (SRH), or the like). The DU may belocated at edges of the network with radio frequency (RF) functionality.

FIG. 4 illustrates example components of BS 110 and UE 120 (as depictedin FIG. 1), which may be used to implement aspects of the presentdisclosure. For example, antennas 452, processors 466, 458, 464, and/orcontroller/processor 480 of the UE 120 and/or antennas 434, processors420, 460, 438, and/or controller/processor 440 of the BS 110 may be usedto perform the various techniques and methods described herein. In anaspect, the BS 110 and the UE 120 may be configured to performoperations relating to spatially multiplexing PUCCH and SRS, accordingto aspects described herein.

At the BS 110, a transmit processor 420 may receive data from a datasource 412 and control information from a controller/processor 440. Thecontrol information may be for the physical broadcast channel (PBCH),physical control format indicator channel (PCFICH), physical hybrid ARQindicator channel (PHICH), physical downlink control channel (PDCCH),group common PDCCH (GC PDCCH), etc. The data may be for the physicaldownlink shared channel (PDSCH), etc. The processor 420 may process(e.g., encode and symbol map) the data and control information to obtaindata symbols and control symbols, respectively. The processor 420 mayalso generate reference symbols, e.g., for the primary synchronizationsignal (PSS), secondary synchronization signal (SSS), and cell-specificreference signal (CRS). A transmit (TX) multiple-input multiple-output(MIMO) processor 430 may perform spatial processing (e.g., precoding) onthe data symbols, the control symbols, and/or the reference symbols, ifapplicable, and may provide output symbol streams to the modulators(MODs) 432 a through 432 t. Each modulator 432 may process a respectiveoutput symbol stream (e.g., for OFDM, etc.) to obtain an output samplestream. Each modulator may further process (e.g., convert to analog,amplify, filter, and upconvert) the output sample stream to obtain adownlink signal. Downlink signals from modulators 432 a through 432 tmay be transmitted via the antennas 434 a through 434 t, respectively.

At the UE 120, the antennas 452 a through 452 r may receive the downlinksignals from the base station 110 and may provide received signals tothe demodulators (DEMODs) in transceivers 454 a through 454 r,respectively. Each demodulator 454 may condition (e.g., filter, amplify,downconvert, and digitize) a respective received signal to obtain inputsamples. Each demodulator may further process the input samples (e.g.,for OFDM, etc.) to obtain received symbols. A MIMO detector 456 mayobtain received symbols from all the demodulators 454 a through 454 r,perform MIMO detection on the received symbols if applicable, andprovide detected symbols. A receive processor 458 may process (e.g.,demodulate, deinterleave, and decode) the detected symbols, providedecoded data for the UE 120 to a data sink 460, and provide decodedcontrol information to a controller/processor 480.

On the uplink, at UE 120, a transmit processor 464 may receive andprocess data (e.g., for the physical uplink shared channel (PUSCH)) froma data source 462 and control information (e.g., for the physical uplinkcontrol channel (PUCCH) from the controller/processor 480. The transmitprocessor 464 may also generate reference symbols for a reference signal(e.g., for the sounding reference signal (SRS)). The symbols from thetransmit processor 464 may be precoded by a TX MIMO processor 466 ifapplicable, further processed by the demodulators in transceivers 454 athrough 454 r (e.g., for SC-FDM, etc.), and transmitted to the basestation 110. At the BS 110, the uplink signals from the UE 120 may bereceived by the antennas 434, processed by the modulators 432, detectedby a MIMO detector 436 if applicable, and further processed by a receiveprocessor 438 to obtain decoded data and control information sent by theUE 120. The receive processor 438 may provide the decoded data to a datasink 439 and the decoded control information to the controller/processor440.

The controllers/processors 440 and 480 may direct the operation at thebase station 110 and the UE 120, respectively. The processor 440 and/orother processors and modules at the BS 110 may perform or direct theexecution of processes for the techniques described herein. The memories442 and 482 may store data and program codes for BS 110 and UE 120,respectively. A scheduler 444 may schedule UEs for data transmission onthe downlink and/or uplink.

FIG. 5 illustrates a diagram 500 showing examples for implementing acommunications protocol stack, according to aspects of the presentdisclosure. The illustrated communications protocol stacks may beimplemented by devices operating in a wireless communication system,such as a 5G system (e.g., a system that supports uplink-basedmobility). Diagram 500 illustrates a communications protocol stackincluding a Radio Resource Control (RRC) layer 510, a Packet DataConvergence Protocol (PDCP) layer 515, a Radio Link Control (RLC) layer520, a Medium Access Control (MAC) layer 525, and a Physical (PHY) layer530. In various examples, the layers of a protocol stack may beimplemented as separate modules of software, portions of a processor orASIC, portions of non-collocated devices connected by a communicationslink, or various combinations thereof. Collocated and non-collocatedimplementations may be used, for example, in a protocol stack for anetwork access device (e.g., ANs, CUs, and/or DUs) or a UE.

A first option 505-a shows a split implementation of a protocol stack,in which implementation of the protocol stack is split between acentralized network access device (e.g., an ANC 202 in FIG. 2) anddistributed network access device (e.g., DU 208 in FIG. 2). In the firstoption 505-a, an RRC layer 510 and a PDCP layer 515 may be implementedby the central unit, and an RLC layer 520, a MAC layer 525, and a PHYlayer 530 may be implemented by the DU. In various examples the CU andthe DU may be collocated or non-collocated. The first option 505-a maybe useful in a macro cell, micro cell, or pico cell deployment.

A second option 505-b shows a unified implementation of a protocolstack, in which the protocol stack is implemented in a single networkaccess device. In the second option, RRC layer 510, PDCP layer 515, RLClayer 520, MAC layer 525, and PHY layer 530 may each be implemented bythe AN. The second option 505-b may be useful in, for example, a femtocell deployment.

Regardless of whether a network access device implements part or all ofa protocol stack, a UE may implement an entire protocol stack as shownin 505-c (e.g., the RRC layer 510, the PDCP layer 515, the RLC layer520, the MAC layer 525, and the PHY layer 530).

In LTE, the basic transmission time interval (TTI) or packet duration isthe 1 ms subframe. In NR, a subframe is still 1 ms, but the basic TTI isreferred to as a slot. A subframe contains a variable number of slots(e.g., 1, 2, 4, 8, 16, . . . slots) depending on the subcarrier spacing.The NR RB is 12 consecutive frequency subcarriers. NR may support a basesubcarrier spacing of 15 KHz and other subcarrier spacing may be definedwith respect to the base subcarrier spacing, for example, 30 kHz, 60kHz, 120 kHz, 240 kHz, etc. The symbol and slot lengths scale with thesubcarrier spacing. The CP length also depends on the subcarrierspacing.

FIG. 6 is a diagram showing an example of a frame format 600 for NR. Thetransmission timeline for each of the downlink and uplink may bepartitioned into units of radio frames. Each radio frame may have apredetermined duration (e.g., 10 ms) and may be partitioned into 10subframes, each of 1 ms, with indices of 0 through 9. Each subframe mayinclude a variable number of slots depending on the subcarrier spacing.Each slot may include a variable number of symbol periods (e.g., 7 or 14symbols) depending on the subcarrier spacing. The symbol periods in eachslot may be assigned indices. A mini-slot is a subslot structure (e.g.,2, 3, or 4 symbols).

Each symbol in a slot may indicate a link direction (e.g., DL, UL, orflexible) for data transmission and the link direction for each subframemay be dynamically switched. The link directions may be based on theslot format. Each slot may include DL/UL data as well as DL/UL controlinformation.

In NR, a synchronization signal (SS) block is transmitted. The SS blockincludes a PSS, a SSS, and a two symbol PBCH. The SS block can betransmitted in a fixed slot location, such as the symbols 0-3 as shownin FIG. 6. The PSS and SSS may be used by UEs for cell search andacquisition. The PSS may provide half-frame timing, the SS may providethe CP length and frame timing. The PSS and SSS may provide the cellidentity. The PBCH carries some basic system information, such asdownlink system bandwidth, timing information within radio frame, SSburst set periodicity, system frame number, etc. The SS blocks may beorganized into SS bursts to support beam sweeping. Further systeminformation such as, remaining minimum system information (RMSI), systeminformation blocks (SIBs), other system information (OSI) can betransmitted on a physical downlink shared channel (PDSCH) in certainsubframes.

In some circumstances, two or more subordinate entities (e.g., UEs) maycommunicate with each other using sidelink signals. Real-worldapplications of such sidelink communications may include public safety,proximity services, UE-to-network relaying, vehicle-to-vehicle (V2V)communications, Internet of Everything (IoE) communications, IoTcommunications, mission-critical mesh, and/or various other suitableapplications. Generally, a sidelink signal may refer to a signalcommunicated from one subordinate entity (e.g., UE1) to anothersubordinate entity (e.g., UE2) without relaying that communicationthrough the scheduling entity (e.g., UE or BS), even though thescheduling entity may be utilized for scheduling and/or controlpurposes. In some examples, the sidelink signals may be communicatedusing a licensed spectrum (unlike wireless local area networks, whichtypically use an unlicensed spectrum).

A UE may operate in various radio resource configurations, including aconfiguration associated with transmitting pilots using a dedicated setof resources (e.g., a radio resource control (RRC) dedicated state,etc.) or a configuration associated with transmitting pilots using acommon set of resources (e.g., an RRC common state, etc.). Whenoperating in the RRC dedicated state, the UE may select a dedicated setof resources for transmitting a pilot signal to a network. Whenoperating in the RRC common state, the UE may select a common set ofresources for transmitting a pilot signal to the network. In eithercase, a pilot signal transmitted by the UE may be received by one ormore network access devices, such as an AN, or a DU, or portionsthereof. Each receiving network access device may be configured toreceive and measure pilot signals transmitted on the common set ofresources, and also receive and measure pilot signals transmitted ondedicated sets of resources allocated to the UEs for which the networkaccess device is a member of a monitoring set of network access devicesfor the UE. One or more of the receiving network access devices, or a CUto which receiving network access device(s) transmit the measurements ofthe pilot signals, may use the measurements to identify serving cellsfor the UEs, or to initiate a change of serving cell for one or more ofthe UEs.

Example Design for Spatially Multiplexing Physical Uplink ControlChannel (PUCCH) and Sounding Reference Signal (SRS)

One constraint for uplink transmissions in 5G NR (e.g., according toRelease 15) is that a UE is allowed to transmit only one uplink channelat one time within one component carrier (CC). Multiple uplink channels(e.g., PUCCH, PUSCH, SRS, etc.) can only be Time Division Multiplexed(TDM) within one CC. The NR standards do not allow using any othermultiplexing mechanism (e.g., Frequency Division Multiplexing, FDM, CodeDivision Multiplexing, CDM, etc.) to transmit multiple uplink channelsat one time within one CC.

A problem with this constraint is that if the UE has multiple uplinkchannels configured or scheduled to be transmitted at the same time,this leads to a collision of the channels. In such a case, the UE eitherhas to drop one or more channels in favor of a particular channel or hasto follow complicated rules to resolve the collision.

In certain aspects, future NR releases are likely to support multipleuplink transmit antennas/transmit chains at the UE. In certain aspects,having multiple transmit antennas/transmit chains allows a UE totransmit multiple uplink channels to a gNB simultaneously in the sametime and frequency resources using spatial multiplexing within the sameCC.

Certain aspects of the present disclosure discuss a design for spatiallymultiplexing two or more uplink channels for UEs that support multipleuplink transmit antennas. For example, spatial multiplexing of SRS andPUCCH includes transmitting SRS using a first set of one or more ULantennas and transmitting PUCCH using a second set of one or more ULantennas different from the first set.

FIG. 7A illustrates spatially multiplexing UL SRS and UL PUCCH, inaccordance with certain aspects of the present disclosure. As shown, theUE 702 has four antennas and transmits the UL SRS and the UL PUCCH togNB 704 as separate spatially multiplexed streams. In an aspect, the UEmay transmit the UL SRS using one or more of the four UE antennas andmay transmit the UL PUCCH using one or more remaining antennas.

In certain aspects, PUCCH generally includes a portion assigned forUplink Control Information (UCI) and a remaining portion assigned forDemodulation Reference Signal (DMRS). As noted in the followingdescription, when spatially multiplexing SRS and PUCCH, it may bebeneficial to avoid collision of resources (e.g., time/frequencyresources) scheduled for SRS and DMRS.

In certain aspects, when PUCCH and PUSCH are configured to betransmitted in the same one or more symbols, the standards allow UCIbits to be piggybacked on PUSCH resources, for example, by transmittingat least a portion of the UCI bits using PUSCH resources. FIG. 7Billustrates spatially multiplexing UL SRS and PUSCH (includingpiggybacked UCI), in accordance with certain aspects of the presentdisclosure. As shown, the UE 702 transmits the UL SRS and the UL PUSCHto gNB 704 as separate spatially multiplexed streams. In an aspect, theUE may transmit the UL SRS using one or more of the four UE antennas andmay transmit the UL PUSCH using one or more remaining antennas. As notedin the following description, when spatially multiplexing SRS and PUSCHincluding piggybacked UCI, it may be beneficial to avoid collision ofresources (e.g., time/frequency resources) scheduled for SRS and UCI.Further, as discussed in certain aspects, if collision of UCI and SRS isunavoidable, the UE attempts to at least avoid collision of ACK/NACKpotion of the UCI with SRS.

The DMRS is generally used by the gNB for estimating UL channels betweenthe UE and the gNB. In certain aspects, it may be beneficial to avoidcollision of resources (e.g., time/frequency resources) scheduled forSRS and DMRS. In an aspect, as long as the gNB correctly receives anddecodes the DMRS, it may separate out UCI and SRS based on the DMRS evenif their respective resources collide. In certain aspects, whenspatially multiplexing SRS and PUCCH (as shown in FIG. 7A), one or morerules may be defined to avoid collision of resources scheduled for SRSand the DMRS portion of PUCCH. In this context, collision of resourcesrefers to two channels being scheduled on the same OFDM symbol and thesame resource block (RB) and possibly the same resource elements (REs).

FIG. 8 illustrates example operations 800 performed by a User Equipment(UE) for spatially multiplexing uplink channels, in accordance withcertain aspects of the present disclosure. Operations 800 begin, at 802,by detecting that a PUCCH and a SRS are to be transmittedsimultaneously. For example, the PUCCH and the SRS are configured (e.g.,via RRC signaling) or scheduled (e.g., via DCI) to be transmitted in thesame OFDM symbol. At 804, the UE decides to spatially multiplex thePUCCH and the SRS for simultaneous transmission via different sets ofone or more antennas. In an aspect, the simultaneous transmissionincludes transmission in the same OFDM symbol. At 806, the UE determinestime and frequency resources for transmission of the PUCCH and the SRSto avoid collision of at least a portion of the PUCCH with the SRS. Inan aspect, the portion of the PUCCH includes DMRS. At 808, the UEtransmits the spatially multiplexed PUCCH and the SRS using thedetermined time and frequency resources. In an aspect, determining thetime and frequency resources includes determining different time andfrequency resources for the DMRS and the SRS.

FIG. 9 illustrates example operations 900 performed by a base station(e.g., gNB) for spatially multiplexing uplink channels, in accordancewith certain aspects of the present disclosure. Operations 900 begin, at902, by indicating to a User Equipment (UE) that a Physical UplinkControl Channel (PUCCH) and a Sounding Reference Signal (SRS) are to betransmitted simultaneously within a same component carrier via differentsets of one or more antennas at the UE. At 904, the BS determines timeand frequency resources for the PUCCH and the SRS to avoid collision ofat least a portion of the PUCCH with the SRS. In an aspect, the portionof the PUCCH includes DMRS. At 906, the BS signals the determined timeand frequency resources to the UE. At 908, the BS receives the spatiallymultiplexed PUCCH and SRS using the determined time and frequencyresources.

NR (e.g., in Release 15) defines five different formats for the PUCCHincluding PUCCH formats 0-4. PUCCH formats 1, 3, and 4 are generallyconfigured to have four or more OFDM symbols and are often referred toas long PUCCH formats. In accordance with the current NR design, inPUCCH formats 1, 3, and 4, UCI and DMRS are always time divisionmultiplexed. For example, UCI and DMRS are scheduled on alternate OFDMsymbols. PUCCH formats 0 and 2 are generally configured to have 1 or 2OFDM symbols and are often referred to as short PUCCH formats. Incertain aspects, a separate set of rules may be defined for spatiallymultiplexing SRS with different PUCCH formats.

Spatially Multiplexing SRS with PUCCH Formats 1, 3 or 4

In certain aspects, when spatially multiplexing SRS and PUCCH formats 1,3, or 4 and when the SRS and the PUCCH are configured or scheduled to betransmitted on the same symbol, SRS may not be allowed to collide withthe DMRS portion of the PUCCH. As noted above, the DMRS is used by a gNBto estimate the uplink channels. Not allowing SRS to collide with DMRShelps protect the DMRS and may assist the channel estimation of thePUCCH at the gNB. In an aspect, the SRS is not allowed to be scheduledon resources (e.g., time and frequency resources) that are assigned forDMRS. For example, the SRS is not allowed to be scheduled on the samesymbol of the same RB as the DMRS. In an aspect, if the DMRS is assigneda particular symbol of a given RB, SRS is allowed to be transmitted inthe same symbol of a different RB. In an aspect, the SRS is not allowedto be transmitted in resource elements (REs) assigned to DMRS. However,SRS is allowed to be transmitted on different REs (not assigned to DMRS)of the same symbol in the same RB.

In certain aspects, SRS is allowed to collide with the UCI. For example,SRS is allowed to be scheduled on the same symbol of the same RB as theUCI. In an aspect, the SRS and UCI are allowed to be scheduled in thesame REs of the same RB.

Spatially Multiplexing SRS with PUCCH Format 2

In certain aspects, when spatially multiplexing SRS and PUCCH format 2and when the SRS and the PUCCH are configured or scheduled to betransmitted on the same symbol of the same RB, SRS is scheduled with thesame comb pattern as the PUCCH and on subcarriers not scheduled for theDMRS. In an aspect, using the same comb pattern helps avoid collision ofthe SRS and the DMRS. In an aspect, when the SRS and the PUCCH format 2are not configured or scheduled to be transmitted on the same symbol ofthe same RB, a nominal comb type is used for the SRS.

In certain aspects, the comb pattern is defined by the division ofsubcarriers between channels when the channels are frequency divisionmultiplexed. For example, when UCI and DMRS are FDMed, in comb 3 DMRSoccupies one third of the subcarriers and UCI occupies the remainingsubcarriers. For example, in comb 3 the DMRS occupies subcarrier indices1, 4, 7, 10 and so on and the UCI occupies the remaining subcarriers.

In comb 2 the DMRS occupies half of the subcarriers and the remainingsubcarriers are occupied by UCI. In comb 4 the DMRS occupies one fourthof the subcarriers and the remaining subcarriers are occupied by UCI.

In accordance with NR standards (e.g., Release 15), PUCCH format 2 usescomb 3 and the nominal comb type for SRS is comb 2 or comb 4. Thus, incertain aspects, when the SRS and PUCCH format 2 are configured orscheduled to collide (e.g., configured or scheduled to be transmitted inthe same symbol of the same RB), the UE changes the comb pattern of SRSto comb 3 to match the comb pattern of PUCCH format 2.

FIG. 10 illustrates spatially multiplexing SRS with PUCCH format 2, inaccordance with certain aspects of the present disclosure.

As shown, PUCCH format 2 uses comb pattern 3 for frequency divisionmultiplexing UCI and DMRS in the same OFDM symbol, with the DMRS bitsoccupying one third of the subcarriers assigned for the PUCCH and theremaining two third subcarriers being occupied by UCI bits. The SRS isalso scheduled on the same OFDM symbol as the PUCCH using comb pattern 3with the SRS occupying one third of the subcarriers assigned for SRS andoccupying subcarriers not occupied by DMRS. As shown, as a result ofusing the same comb pattern, the SRS does not collide with the DMRSportion of the PUCCH. However, as shown, the SRS collides with at leasta portion of the UCI portion of the PUCCH.

In certain aspects, when spatially multiplexing SRS and PUCCH of any ofthe PUCCH formats 0-4, while the SRS may not be allowed to collide withthe DMRS part of the PUCCH, the SRS may be allowed to collide with atleast a portion of the UCI. As noted above, as long as the gNB correctlyreceives and decodes the DMRS and estimates the PUCCH based on the DMRS,it may separate out UCI and SRS even if their respective resourcescollide. Thus, it is beneficial to protect the DMRS over the UCI.

In certain aspects, rules may be defined when the SRS and the UCIportion of the PUCCH are configured to collide. In an aspect, when theSRS and the UCI portion of the PUCCH are configured or scheduled to betransmitted on the same symbol and the same RB, both the SRS and thePUCCH are scheduled and transmitted on the colliding resources only ifthe SRS is at least X RBs wide and/or Y times larger than the PUCCH size(e.g, in number of RBs).

In an aspect, the values of X and Y depend on the SRS use case. Forexample, the SRS use case may include codebook based SRS (when uplinktransmissions are based on a precoder selected from a codebook),non-codebook based SRS (when the UE selects its own precoder fortransmitting SRS), SRS with antenna switching (e.g., when UE transmitsSRS on one antenna at a time). In an aspect, the values of X and Ydepend on the PUCCH format. For example, the X and Y values may belarger if the PUCCH is using format 0 or 1, and the X and Y values maybe smaller if the PUCCH is using format 2, 3 or 4. In an aspect, thevalues of X and Y may be RRC configured or implicitly derived at the UE.

In certain aspects, if the above conditions relating to the size of theSRS are not met, the SRS and the PUCCH are not allowed to collide. Forexample, one of the channels is dropped following nominal priority rulesdefined in NR (e.g., Release 15).

In certain aspects, when the PUCCH (or at least the UCI portion of thePUCCH) is configured to collide with SRS, the UE may schedule the PUCCH(or at least the UCI) by puncturing resources (e.g., REs) scheduled forthe SRS based on a puncturing pattern. In an aspect, puncturingresources scheduled for the SRS incudes dropping SRS transmission onresources that overlap with the PUCCH (or at least UCI) and not droppingSRS on resources that do not overlap with PUCCH (or at least UCI). Forexample, assuming SRS is scheduled on 12 REs with signals s1,s2, . . .,s12, and further assuming that 6 of the 12 REs are colliding with PUCCHtransmission (e.g., the REs carrying s1, . . . ,s6 are colliding withPUCCH), in this case puncturing means that UE drops s1-s6 and transmitss7, . . . ,s12 (i.e., the remaining un-punctured signal on thenon-overlapping REs). In an aspect, the puncturing pattern of the SRSmay be RRC configured or included in DCI.

Additionally or alternatively, the puncturing pattern depends on thePUCCH format. For example, the UE punctures SRS resources if collidingwith PUCCH formats 0 and 2, and does not puncture the SRS resources ifcolliding with PUCCH formats 1, 3, or 4.

In certain aspects, when the PUCCH (or at least the UCI portion of thePUCCH) is configured to collide with SRS, the UE may rate match the SRSaround the PUCCH (or at least the UCI) transmission. For example,following the same example as used for explaining puncturing, ratematching means that, UE re-generates another SRS signal of length 6,e.g., a1, . . . ,a6 based on the new length of the SRS, and transmitsa1, . . . ,a6 on the 6 non-overlapping REs.

In certain aspects, when PUCCH and PUSCH are configured to betransmitted in the same one or more symbols, the standards allow UCIbits to be piggybacked on PUSCH resources, for example, by transmittingat least a portion of the UCI bits using PUSCH resources. In certainaspects, when the UCI bits are piggybacked on PUSCH resources and thePUSCH collides with SRS (e.g., when SRS and PUSCH are spatiallymultiplexed as shown in FIG. 7B), the UE first maps UCI bits to PUSCHresources (e.g., symbols/REs) that do not collide with SRS to protectUCI. In an aspect, if there are not enough PUSCH resources that do notcollide with SRS to convey all UCI bits, a remaining portion of the UCIbits may be mapped to PUSCH resources (e.g., symbols/REs) that collidewith SRS. In an aspect, the UE first maps ACK/NACK bits and then mapsCSI reports, in order to protect the ACK/NACK bits. For example, the UEmaps the ACK/NACK bits and one portion of the CSI reports to PUSCHresources that do not collide with SRS, and maps the remaining portionof CSI reports to the PUSCH resources that collide with SRS. In anaspect, the PUSCH (including the piggybacked UCI) and the SRS aretransmitted over different sets of antennas.

FIG. 11 illustrates example operations 1100 performed by a UE formapping UCI to PUSCH resources when the PUSCH collides with SRS, inaccordance with certain aspects of the present disclosure.

Operations 1100 begin, at 1102, by deciding to spatially multiplex aPUSCH and a SRS for simultaneous transmission via different sets of oneor more antennas. At 1104, the UE determines that that Uplink ControlInformation (UCI) is to be transmitted using resources assigned for thePUSCH, and that at least a portion of time and frequency resources forthe PUSCH is to be used for transmission of the SRS (e.g., SRS collidingwith a portion of the PUSCH). At 1106, the UE determines a resourcemapping pattern for mapping the UCI to the PUSCH resources, wherein theresource mapping pattern avoids collision of the UCI with the SRS. At1108, the UE maps the UCI to the PUSCH resources based on the resourcemapping pattern. At 1110, the UE transmits the spatially multiplexedPUSCH and the SRS after the mapping.

FIG. 12 illustrates example operations 1200 performed by a BS (e.g.,gNB) for mapping UCI to PUSCH resources when the PUSCH collides withSRS, in accordance with certain aspects of the present disclosure.

Operations 1200 begin, at 1202, by deciding that a Physical UplinkShared Channel (PUSCH) and a Sounding Reference Signal (SRS) are to bespatially multiplexed for simultaneous transmission from a UE viadifferent sets of one or more antennas at a UE. At 1204, the BSindicates the spatial multiplexing to the UE. At 1206, the BS detectsthat Uplink Control Information (UCI) is to be received using resourcesassigned for the PUSCH, and that at least a portion of time andfrequency resources for the PUSCH is to be used for receiving a SoundingReference Signal (SRS). At 1208, the BS determines a resource mappingpattern for mapping the UCI to the PUSCH resources, wherein the resourcemapping pattern avoids collision of the UCI with the SRS. At 1210, theBS receives the UCI based on the resource mapping pattern.

In an aspect, the resource mapping pattern includes first mapping aportion of the UCI bits using PUSCH resources not to be used for theSRS, and then mapping a remaining portion of the UCI bits using PUSCHresources to be used for SRS. In an aspect, the resource mapping patternincludes mapping the UCI bits indicating the ACK/NACK bits before theUCI bits indicating channel state indication (C SI), in order to protectACK/NACK.

FIG. 13 illustrates a communications device 1300 that may includevarious components (e.g., corresponding to means-plus-functioncomponents) configured to perform operations for the techniquesdisclosed herein, such as the operations illustrated in FIG. 8. Thecommunications device 1300 includes a processing system 1302 coupled toa transceiver 1310. The transceiver 1310 is configured to transmit andreceive signals for the communications device 1300 via an antenna 1312,such as the various signals described herein. The processing system 1302may be configured to perform processing functions for the communicationsdevice 1300, including processing signals received and/or to betransmitted by the communications device 1300.

The processing system 1302 includes a processor 1304 coupled to acomputer-readable medium/memory 1306 via a bus 1308. In certain aspects,the computer-readable medium/memory 1306 is configured to storecomputer-executable instructions that when executed by processor 1304,cause the processor 1304 to perform the operations illustrated in FIG. 8or other operations for performing the various techniques discussedherein.

In certain aspects, the processing system 1302 further includes adetecting component 1314, a deciding component 1316, and a schedulingcomponent 1318 for performing the operations illustrated in FIG. 8. Inan aspect, the detecting component 1314 is configured to detect that aPUCCH and a SRS are configured to be transmitted simultaneously. Thedeciding component 1316 is configured to decide to spatially multiplexthe PUCCH and the SRS for simultaneous transmission via different setsof one or more antennas. The scheduling component 1318 is configured toschedule time and frequency resources for the PUCCH and the SRS to avoidcollision of at least a portion of the PUCCH (e.g., DMRS) with the SRS.The transceiver 1310 is configured to transmit the spatially multiplexedPUCCH and SRS using the scheduled time and frequency resources. Thecomponents 1314-1318 may be coupled to the processor 1304 via bus 1308.In certain aspects, the components 1314-1318 may be hardware circuits.In certain aspects, the components 1314-1318 may be software componentsthat are executed and run on processor 1304.

FIG. 14 illustrates a communications device 1400 that may includevarious components (e.g., corresponding to means-plus-functioncomponents) configured to perform operations for the techniquesdisclosed herein, such as the operations illustrated in FIG. 9. Thecommunications device 1400 includes a processing system 1402 coupled toa transceiver 1410. The transceiver 1410 is configured to transmit andreceive signals for the communications device 1400 via an antenna 1412,such as the various signals described herein. The processing system 1402may be configured to perform processing functions for the communicationsdevice 1400, including processing signals received and/or to betransmitted by the communications device 1400.

The processing system 1402 includes a processor 1404 coupled to acomputer-readable medium/memory 1406 via a bus 1408. In certain aspects,the computer-readable medium/memory 1406 is configured to storecomputer-executable instructions that when executed by processor 1404,cause the processor 1404 to perform the operations illustrated in FIG. 9or other operations for performing the various techniques discussedherein.

In certain aspects, the processing system 1402 further includes anindicating component 1414, a determining component 1416, and a signalingcomponent 1418 for performing the operations illustrated in FIG. 9. Inan aspect, the indicating component is configured to determine andindicate (e.g., using the transceiver 1410) to the UE that the PUCCH andthe SRS are to be transmitted simultaneously. The determining component1416 is configured to determine time and frequency resources for thePUCCH and the SRS to avoid collision of at least a portion of the PUCCH(e.g., DMRS) with the SRS. The signaling component 1418 is configured tosignal (e.g., using the transceiver 1410) the determined time andfrequency resources to the UE. The transceiver 1410 is configured toreceive the spatially multiplexed PUCCH and the SRS using the determinedtime and frequency resources. The components 1414-1418 may be coupled tothe processor 1404 via bus 1408. In certain aspects, the components1414-1418 may be hardware circuits. In certain aspects, the components1414-1418 may be software components that are executed and run onprocessor 1404.

FIG. 15 illustrates a communications device 1500 that may includevarious components (e.g., corresponding to means-plus-functioncomponents) configured to perform operations for the techniquesdisclosed herein, such as the operations illustrated in FIG. 11. Thecommunications device 1500 includes a processing system 1502 coupled toa transceiver 1510. The transceiver 1510 is configured to transmit andreceive signals for the communications device 1500 via an antenna 1512,such as the various signals described herein. The processing system 1502may be configured to perform processing functions for the communicationsdevice 1500, including processing signals received and/or to betransmitted by the communications device 1500.

The processing system 1502 includes a processor 1504 coupled to acomputer-readable medium/memory 1506 via a bus 1508. In certain aspects,the computer-readable medium/memory 1506 is configured to storecomputer-executable instructions that when executed by processor 1504,cause the processor 1504 to perform the operations illustrated in FIG.11 or other operations for performing the various techniques discussedherein.

In certain aspects, the processing system 1502 further includes adeciding component 1514, a determining component 1516, and a mappingcomponent 1518 for performing the operations illustrated in FIG. 11. Inan aspect, the deciding component 1514 is configured to decide tospatially multiplex a PUSCH and a SRS for simultaneous transmission viadifferent sets of one or more antennas. The determining component 1516is configured to determine that UCI is to be transmitted using resourcesassigned for the PUSCH, and that at least a portion of time andfrequency resources for the PUSCH is to be used for transmission of theSRS. The determining component 1516 is further configured to determine aresource mapping pattern for mapping the UCI to the PUSCH resources,wherein the resource mapping pattern avoids collision of the UCI withthe SRS. The mapping component 1518 is configured to map the UCI to thePUSCH resources based on the resource mapping pattern. The transceiver1510 is configured to transmit the spatially multiplexed PUSCH and theSRS after the mapping. The components 1514-1518 may be coupled to theprocessor 1504 via bus 1508. In certain aspects, the components1514-1518 may be hardware circuits. In certain aspects, the components1514-1518 may be software components that are executed and run onprocessor 1504.

FIG. 16 illustrates a communications device 1600 that may includevarious components (e.g., corresponding to means-plus-functioncomponents) configured to perform operations for the techniquesdisclosed herein, such as the operations illustrated in FIG. 12. Thecommunications device 1600 includes a processing system 1602 coupled toa transceiver 1610. The transceiver 1610 is configured to transmit andreceive signals for the communications device 1600 via an antenna 1612,such as the various signals described herein. The processing system 1602may be configured to perform processing functions for the communicationsdevice 1600, including processing signals received and/or to betransmitted by the communications device 1600.

The processing system 1602 includes a processor 1604 coupled to acomputer-readable medium/memory 1606 via a bus 1608. In certain aspects,the computer-readable medium/memory 1606 is configured to storecomputer-executable instructions that when executed by processor 1604,cause the processor 1604 to perform the operations illustrated in FIG.12 or other operations for performing the various techniques discussedherein.

In certain aspects, the processing system 1602 further includes adeciding component 1614, an indicating component 1616, a detectingcomponent 1618, and a determining component 1620 for performing theoperations illustrated in FIG. 12. In an aspect, the deciding component1614 is configured to decide that a PUSCH and a SRS are to be spatiallymultiplexed for simultaneous transmission from a UE via different set ofone or more antennas at a UE. The indicating component 1616 isconfigured to indicate the spatial multiplexing to the UE. The detectingcomponent 1618 is configured to detect that UCI is to be received usingresources assigned for the PUSCH, and that at least a portion of timeand frequency resources for the PUSCH is to be used for receiving a SRS.The determining component 1620 is configured to determine a resourcemapping pattern for mapping the UCI to the PUSCH resources, wherein theresource mapping pattern avoids collision of the UCI with the SRS. Thetransceiver is configured to receive the UCI based on the resourcemapping pattern. The components 1614-1620 may be coupled to theprocessor 1604 via bus 1608. In certain aspects, the components1614-1620 may be hardware circuits. In certain aspects, the components1614-1620 may be software components that are executed and run onprocessor 1604.

The methods disclosed herein comprise one or more steps or actions forachieving the methods. The method steps and/or actions may beinterchanged with one another without departing from the scope of theclaims. In other words, unless a specific order of steps or actions isspecified, the order and/or use of specific steps and/or actions may bemodified without departing from the scope of the claims.

As used herein, a phrase referring to “at least one of” a list of itemsrefers to any combination of those items, including single members. Asan example, “at least one of: a, b, or c” is intended to cover a, b, c,a-b, a-c, b-c, and a-b-c, as well as any combination with multiples ofthe same element (e.g., a-a, a-a-a, a-a-b, a-a-c, a-b-b, a-c-c, b-b,b-b-b, b-b-c, c-c, and c-c-c or any other ordering of a, b, and c).

As used herein, the term “determining” encompasses a wide variety ofactions. For example, “determining” may include calculating, computing,processing, deriving, investigating, looking up (e.g., looking up in atable, a database or another data structure), ascertaining and the like.Also, “determining” may include receiving (e.g., receiving information),accessing (e.g., accessing data in a memory) and the like. Also,“determining” may include resolving, selecting, choosing, establishingand the like.

The previous description is provided to enable any person skilled in theart to practice the various aspects described herein. Variousmodifications to these aspects will be readily apparent to those skilledin the art, and the generic principles defined herein may be applied toother aspects. Thus, the claims are not intended to be limited to theaspects shown herein, but is to be accorded the full scope consistentwith the language of the claims, wherein reference to an element in thesingular is not intended to mean “one and only one” unless specificallyso stated, but rather “one or more.” Unless specifically statedotherwise, the term “some” refers to one or more. All structural andfunctional equivalents to the elements of the various aspects describedthroughout this disclosure that are known or later come to be known tothose of ordinary skill in the art are expressly incorporated herein byreference and are intended to be encompassed by the claims. Moreover,nothing disclosed herein is intended to be dedicated to the publicregardless of whether such disclosure is explicitly recited in theclaims. No claim element is to be construed under the provisions of 35U.S.C. § 112(f) unless the element is expressly recited using the phrase“means for” or, in the case of a method claim, the element is recitedusing the phrase “step for.”

The various operations of methods described above may be performed byany suitable means capable of performing the corresponding functions.The means may include various hardware and/or software component(s)and/or module(s), including, but not limited to a circuit, anapplication specific integrated circuit (ASIC), or processor. Generally,where there are operations illustrated in figures, those operations mayhave corresponding counterpart means-plus-function components withsimilar numbering.

The various illustrative logical blocks, modules and circuits describedin connection with the present disclosure may be implemented orperformed with a general purpose processor, a digital signal processor(DSP), an application specific integrated circuit (ASIC), a fieldprogrammable gate array (FPGA) or other programmable logic device (PLD),discrete gate or transistor logic, discrete hardware components, or anycombination thereof designed to perform the functions described herein.A general-purpose processor may be a microprocessor, but in thealternative, the processor may be any commercially available processor,controller, microcontroller, or state machine. A processor may also beimplemented as a combination of computing devices, e.g., a combinationof a DSP and a microprocessor, a plurality of microprocessors, one ormore microprocessors in conjunction with a DSP core, or any other suchconfiguration.

If implemented in hardware, an example hardware configuration maycomprise a processing system in a wireless node. The processing systemmay be implemented with a bus architecture. The bus may include anynumber of interconnecting buses and bridges depending on the specificapplication of the processing system and the overall design constraints.The bus may link together various circuits including a processor,machine-readable media, and a bus interface. The bus interface may beused to connect a network adapter, among other things, to the processingsystem via the bus. The network adapter may be used to implement thesignal processing functions of the PHY layer. In the case of a userterminal 120 (see FIG. 1), a user interface (e.g., keypad, display,mouse, joystick, etc.) may also be connected to the bus. The bus mayalso link various other circuits such as timing sources, peripherals,voltage regulators, power management circuits, and the like, which arewell known in the art, and therefore, will not be described any further.The processor may be implemented with one or more general-purpose and/orspecial-purpose processors. Examples include microprocessors,microcontrollers, DSP processors, and other circuitry that can executesoftware. Those skilled in the art will recognize how best to implementthe described functionality for the processing system depending on theparticular application and the overall design constraints imposed on theoverall system.

If implemented in software, the functions may be stored or transmittedover as one or more instructions or code on a computer readable medium.Software shall be construed broadly to mean instructions, data, or anycombination thereof, whether referred to as software, firmware,middleware, microcode, hardware description language, or otherwise.Computer-readable media include both computer storage media andcommunication media including any medium that facilitates transfer of acomputer program from one place to another. The processor may beresponsible for managing the bus and general processing, including theexecution of software modules stored on the machine-readable storagemedia. A computer-readable storage medium may be coupled to a processorsuch that the processor can read information from, and write informationto, the storage medium. In the alternative, the storage medium may beintegral to the processor. By way of example, the machine-readable mediamay include a transmission line, a carrier wave modulated by data,and/or a computer readable storage medium with instructions storedthereon separate from the wireless node, all of which may be accessed bythe processor through the bus interface. Alternatively, or in addition,the machine-readable media, or any portion thereof, may be integratedinto the processor, such as the case may be with cache and/or generalregister files. Examples of machine-readable storage media may include,by way of example, RAM (Random Access Memory), flash memory, ROM (ReadOnly Memory), PROM (Programmable Read-Only Memory), EPROM (ErasableProgrammable Read-Only Memory), EEPROM (Electrically ErasableProgrammable Read-Only Memory), registers, magnetic disks, opticaldisks, hard drives, or any other suitable storage medium, or anycombination thereof. The machine-readable media may be embodied in acomputer-program product.

A software module may comprise a single instruction, or manyinstructions, and may be distributed over several different codesegments, among different programs, and across multiple storage media.The computer-readable media may comprise a number of software modules.The software modules include instructions that, when executed by anapparatus such as a processor, cause the processing system to performvarious functions. The software modules may include a transmissionmodule and a receiving module. Each software module may reside in asingle storage device or be distributed across multiple storage devices.By way of example, a software module may be loaded into RAM from a harddrive when a triggering event occurs. During execution of the softwaremodule, the processor may load some of the instructions into cache toincrease access speed. One or more cache lines may then be loaded into ageneral register file for execution by the processor. When referring tothe functionality of a software module below, it will be understood thatsuch functionality is implemented by the processor when executinginstructions from that software module.

Also, any connection is properly termed a computer-readable medium. Forexample, if the software is transmitted from a website, server, or otherremote source using a coaxial cable, fiber optic cable, twisted pair,digital subscriber line (DSL), or wireless technologies such as infrared(IR), radio, and microwave, then the coaxial cable, fiber optic cable,twisted pair, DSL, or wireless technologies such as infrared, radio, andmicrowave are included in the definition of medium. Disk and disc, asused herein, include compact disc (CD), laser disc, optical disc,digital versatile disc (DVD), floppy disk, and Blu-ray® disc where disksusually reproduce data magnetically, while discs reproduce dataoptically with lasers. Thus, in some aspects computer-readable media maycomprise non-transitory computer-readable media (e.g., tangible media).In addition, for other aspects computer-readable media may comprisetransitory computer-readable media (e.g., a signal). Combinations of theabove should also be included within the scope of computer-readablemedia.

Thus, certain aspects may comprise a computer program product forperforming the operations presented herein. For example, such a computerprogram product may comprise a computer-readable medium havinginstructions stored (and/or encoded) thereon, the instructions beingexecutable by one or more processors to perform the operations describedherein. For example, instructions for performing the operationsdescribed herein and illustrated in FIGS. 8-9 and 11-12.

Further, it should be appreciated that modules and/or other appropriatemeans for performing the methods and techniques described herein can bedownloaded and/or otherwise obtained by a user terminal and/or basestation as applicable. For example, such a device can be coupled to aserver to facilitate the transfer of means for performing the methodsdescribed herein. Alternatively, various methods described herein can beprovided via storage means (e.g., RAM, ROM, a physical storage mediumsuch as a compact disc (CD) or floppy disk, etc.), such that a userterminal and/or base station can obtain the various methods uponcoupling or providing the storage means to the device. Moreover, anyother suitable technique for providing the methods and techniquesdescribed herein to a device can be utilized.

It is to be understood that the claims are not limited to the preciseconfiguration and components illustrated above. Various modifications,changes and variations may be made in the arrangement, operation anddetails of the methods and apparatus described above without departingfrom the scope of the claims.

What is claimed is:
 1. A method for wireless communication by a UserEquipment (UE), comprising: detecting that a Physical Uplink ControlChannel (PUCCH) and a Sounding Reference Signal (SRS) are to betransmitted simultaneously; deciding to spatially multiplex the PUCCHand the SRS for simultaneous transmission via different sets of one ormore antennas; determining time and frequency resources for the PUCCHand the SRS to avoid collision of at least a portion of the PUCCH withthe SRS; and transmitting the spatially multiplexed PUCCH and SRS usingthe determined time and frequency resources.
 2. The method of claim 1,wherein the detecting includes detecting that the PUCCH and the SRS areconfigured or scheduled to be transmitted in a same OFDM symbol.
 3. Themethod of claim 1, wherein the portion includes a Demodulation ReferenceSignal (DMRS).
 4. The method of claim 3, wherein determining the timeand frequency resources includes determining different time andfrequency resources for the DMRS and the SRS.
 5. The method of claim 4,wherein the PUCCH is according to PUCCH Formats 1, 3 or
 4. 6. The methodof claim 5, wherein the determining includes determining that the SRSand the DMRS are to be transmitted on different OFDM symbols.
 7. Themethod of claim 5, wherein the determining includes determining the SRSis to be transmitted on the same OFDM symbol in a different resourceblock than the DMRS.
 8. The method of claim 5, wherein the determiningincludes determining the SRS is to be transmitted on the same OFDMsymbol and in a same resource block as the DMRS, wherein the SRS isscheduled on resource elements (REs) not scheduled for the DMRS.
 9. Themethod of claim 4, wherein the PUCCH is according to PUCCH Format 2, andwherein the detecting includes detecting the SRS is to be transmitted onthe same OFDM symbol in a same resource block as the DMRS.
 10. Themethod of claim 10, wherein the determining includes: determining a combpattern for the SRS same as a comb pattern used for the DMRS; anddetermining the resources for the SRS based on the determined combpattern on subcarriers not occupied by the DMRS.
 11. The method of claim1, wherein the detecting includes detecting that at least a remainingportion of the PUCCH and the SRS are configured to be transmitted on asame OFDM symbol of a same resource block.
 12. The method of claim 11,wherein the determining includes determining the same OFDM symbol of thesame resource block for transmission of the remaining portion and theSRS if the SRS is at least one of X resource blocks wide or Y timeswider than the PUCCH.
 13. The method of claim 12, wherein values of Xand Y are determined based on at least one of an SRS use case or aformat of the PUCCH.
 14. The method of claim 12, wherein values of X andY are configured via Radio Resource Control (RRC) signaling.
 15. Themethod of claim 12, wherein the determining further includes:determining a puncturing pattern for the SRS; and determining theresources for the remaining portion by puncturing resource elements(REs) scheduled for the SRS based on the puncturing pattern.
 16. Themethod of claim 15, wherein the puncturing pattern is based on a formatof the PUCCH.
 17. The method of claim 12, wherein the determiningfurther includes rate matching transmission of the SRS aroundtransmission of the remaining portion.
 18. The method of claim 11,wherein the remaining portion includes uplink control information (UCI).19. A method for wireless communication by a User Equipment (UE)comprising: deciding to spatially multiplex a Physical Uplink SharedChannel (PUSCH) and a Sounding Reference Signal (SRS) for simultaneoustransmission via different sets of one or more antennas; determiningthat Uplink Control Information (UCI) is to be transmitted usingresources assigned for the PUSCH, and that at least a portion of timeand frequency resources for the PUSCH is to be used for transmission ofthe SRS; determining a resource mapping pattern for mapping the UCI tothe PUSCH resources, wherein the resource mapping pattern avoidscollision of the UCI with the SRS; mapping the UCI to the PUSCHresources based on the resource mapping pattern; and transmitting thespatially multiplexed PUSCH and the SRS after the mapping.
 20. Themethod of claim 19, wherein the mapping includes mapping at least aportion of UCI bits indicating acknowledgement/negative acknowledgement(ACK/NACK) using the PUSCH resources not to be used for the SRS.
 21. Themethod of claim 20, wherein the mapping includes, after mapping the atleast a portion of the UCI bits indicating ACK/NACK, mapping a remainingportion of the UCI bits indicating ACK/NACK and at least a portion ofthe UCI bits indicating channel state indication (CSI) using the PUSCHresources to be used for SRS.
 22. The method of claim 19, wherein themapping includes mapping UCI bits indicating acknowledgement/negativeacknowledgement (ACK/NACK) before mapping the UCI bits indicatingchannel state indication (CSI).
 23. A method for wireless communicationby a Base Station (BS), comprising: indicating to a User Equipment (UE)that a Physical Uplink Control Channel (PUCCH) and a Sounding ReferenceSignal (SRS) are to be transmitted simultaneously within a samecomponent carrier via different sets of one or more antennas at the UE;determining time and frequency resources for the PUCCH and the SRS toavoid collision of at least a portion of the PUCCH with the SRS;signaling the determined time and frequency resources to the UE; andreceiving the spatially multiplexed PUCCH and SRS using the determinedtime and frequency resources.
 24. The method of claim 23, wherein theindicating includes configuring or scheduling the UE to transmit thePUCCH and the SRS in a same OFDM symbol.
 25. The method of claim 23,wherein the portion includes an uplink Demodulation Reference Signal(DMRS).
 26. The method of claim 25, wherein determining the time andfrequency resources includes determining different time and frequencyresources for the DMRS and the SRS.
 27. A method for wirelesscommunication by a Base Station (BS), comprising: deciding that aPhysical Uplink Shared Channel (PUSCH) and a Sounding Reference Signal(SRS) are to be spatially multiplexed for simultaneous transmission froma UE via different sets of one or more antennas at a UE; indicating thespatial multiplexing to the UE; detecting that Uplink ControlInformation (UCI) is to be received using resources assigned for thePUSCH, and that at least a portion of time and frequency resources forthe PUSCH is to be used for receiving a Sounding Reference Signal (SRS);determining a resource mapping pattern for mapping the UCI to the PUSCHresources, wherein the resource mapping pattern avoids collision of theUCI with the SRS; and receiving the UCI based on the resource mappingpattern.
 28. The method of claim 27, wherein the resource mappingpattern includes mapping at least a portion of UCI bits indicatingacknowledgement/negative acknowledgement (ACK/NACK) using the PUSCHresources not to be used for the SRS.
 29. The method of claim 28,wherein the resource mapping pattern includes, after mapping the atleast a portion of the UCI bits indicating ACK/NACK, mapping a remainingportion of the UCI bits indicating ACK/NACK and at least a portion ofthe UCI bits indicating channel state indication (CSI)using the PUSCHresources to be used for SRS.
 30. The method of claim 27, wherein theresource mapping pattern includes mapping UCI bits indicatingacknowledgement before the UCI bits indicating channel state indication(CSI).